tree 5c8500376ebbb9fe73979e6d1a49d04c2652482a
parent 69086bd698574501a59073b07b629f2a00b82552
author Miroslav Benes <mbenes@suse.cz> 1585214762 +0100
committer Juergen Gross <jgross@suse.com> 1585582324 +0200

x86/xen: Make the boot CPU idle task reliable

The unwinder reports the boot CPU idle task's stack on XEN PV as
unreliable, which affects at least live patching. There are two reasons
for this. First, the task does not follow the x86 convention that its
stack starts at the offset right below saved pt_regs. It allows the
unwinder to easily detect the end of the stack and verify it. Second,
startup_xen() function does not store the return address before jumping
to xen_start_kernel() which confuses the unwinder.

Amend both issues by moving the starting point of initial stack in
startup_xen() and storing the return address before the jump, which is
exactly what call instruction does.

Signed-off-by: Miroslav Benes <mbenes@suse.cz>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>